After the last round of votes concludes Monday night, 28 senators plan to talk the night away in series of speeches delivered on the chamber floor, focused on climate change.

Although some call it a political stunt, the senators insist the event -- organized by the Climate Action Task Force -- will raise public awareness about global warming and how to stem it.

“So many senators coming together for an all-night session shows our commitment to wake up Congress to the dangers of climate change,” Sen. Barbara Boxer (D-Calif.), one of the founders of the task force, said in a statement.

Twenty-six Democrats and two independents are to participate.

“Climate change is real, it is caused by humans, and it is solvable,” said Sen. Brian Schatz (D-Hawaii). “Congress must act.” He and Sen. Sheldon Whitehouse (D-R.I.), the two organizers of the event, plan to give their colleagues a nap break from 1 a.m. to 6 a.m. when they dominate the floor.

A spokeswoman for Schatz, Meaghan Smith, said the task force does not plan to use the event to announce any new bills or concrete measures. “We’ll see” about introducing legislation this session, she said. “This isn’t a litmus test or anything.… This is really meant to galvanize momentum.”

Several top Democratic senators from coal-mining and oil-producing states who are facing competitive midterm races are conspicuously absent from the roster, including Sens. Kay Hagan of North Carolina, Mark Begich of Alaska and Mark Pryor of Arkansas.

The all-nighter will begin after the last votes are cast around 6 p.m. and will open with remarks from four Senate Democratic leaders: Harry Reid (D-Nev.), Richard J. Durbin (D-Ill.), Charles E. Schumer (D-N.Y.) and Patty Murray (D-Wash.). The senators will take turns speaking until 9 or 10 a.m. Tuesday.

There has been little talk of legislation to tackle climate change in Congress since 2010, when a bill to reduce carbon emissions died in the Senate.

But as they rev up for the midterm elections, Democrats are heeding the call of California billionaire Tom Steyer, who has pledged $100 million to back candidates with a program to curb climate change.

The campaign is intended to counter the Koch brothers, billionaire industrialists Charles and David Koch, who are behind some of influential political committees that have opposed legislation to reduce greenhouse gas emissions.